Mindray Resona 7T - ECG Module

4-6 Product Principle
4.2.4 ECG Module
Input
protection
LA_IN
RA_IN
LL_IN
MINDRAY ASIC
LA
RA
LL
SPI
RESET
Reset
(TPS3828)
JTAG
Upper
machine
UART
iso
lat
ion
DC_IN
UART
12V
POWER
ADC
tra
nsf
orm
er
+
-
+
-
+
-
+
-
+
-
+
-
ADC
Input Buffer Amplifier
High-pass
filter wave
Low-pass
filter
wave
MCU
(STM32F205
)
Clock
(12MHz)
Offset
adjustment
High-pass
filter wave
Amplitude
adjustment
Clock
(11.0592MHz)
High-pass
filter wave
Breathi
ng test
wave
Low-pass fil ter
wave
Carrier
circuit
Buffering
circuit
ECG
DC_IN
RESPIRATION
PWM
Simulati
on
switch
(CD4053)
Via simulation switch
RA-LA or RA-LL
PCG
High-pass
filter wave
Amplitude
adjustment
Offset
adjustment
ADC
PCG
Low-pass
filter
wave
Figure 6 Principle Diagram of ECG module
The ECG module is designed for monitoring of ECG signals and display of ECG waveforms, which
serve as the reference of ultrasound images. This module can synchronously trigger display of 2-D
images and color flow images. After the ECG signal is amplified, filtered and sampled, the signal is
sent to the DSC module through the serial port; at the same time the R-wave is detected, and the
detected ECG-triggering signal is sent to the system controllers through interrupt, to start the scan
transmission.
The detail specifications are:
 Support 3 lead: RA, LA and LL available.
 Do not support lead reorganization.
 Only support one channel.
 AC overloading protection, 50Hz/60Hz, 1Vp-p, duration 10s, module return to be normal after
overload signal disappear
 3 lead provides drop check of all limbs lead and RL lead.
 QRS: 0.2mV.
 Input impedance is more than 5 MΩ (10Hz).
 The input range of ECG is ±8 mV.